Datasheet Microchip SY89845UMG

Datasheets

NOT RECOMMENDED FOR NEW DESIGNS SY89845UPrecision CML Runt Pulse Eliminator 2:1 MUXwith 1:2 Fanout and Internal Termination General DescriptionThe SY89845U is a low jitter CML, 2:1 differentialinput multiplexer (MUX) optimized for redundantsource switchover applications. Unlike standardmultiplexers, the SY89845U unique 2:1 Runt PulseEliminator (RPE) MUX prevents any short cycles orвЂњruntвЂќ pulses during switchover. In addition, a uniqueFail-Safe Input protection prevents metastableconditions when the selected input clock fails to aDC voltage (voltage between the pins of thedifferential input drops below 100mV).The differential input includes MicrelвЂ™s unique, 3-pininput termination architecture that allows customersto interface to any differential signal (AC-or DCcoupled) as small as 100mV (200mVPP) without anylevel shifting or termination resistor networks in thesignal path. The outputs are 400mV CML with fastrise/fall times guaranteed to be less than 80ps.The SY89845U operates from a 2.5V В±5% or 3.3VВ±10% supply and is guaranteed over the fullindustrial temperature range of вЂ“40В°C to +85В°C. TheSY89845U is part of MicrelвЂ™s high-speed, Precision …